1 /* Test program for elf_update function. 2 Copyright (C) 2000, 2002, 2005 Red Hat, Inc. 3 This file is part of elfutils. 4 Written by Ulrich Drepper <drepper (at) redhat.com>, 2000. 5 6 This file is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 3 of the License, or 9 (at your option) any later version. 10 11 elfutils is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 14 GNU General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with this program. If not, see <http://www.gnu.org/licenses/>. */ 18 19 #ifdef HAVE_CONFIG_H 20 # include <config.h> 21 #endif 22 23 #include <errno.h> 24 #include <fcntl.h> 25 #include <libelf.h> 26 #include <stdio.h> 27 #include <stdlib.h> 28 #include <string.h> 29 #include <unistd.h> 30 31 32 int 33 main (int argc, char *argv[] __attribute__ ((unused))) 34 { 35 const char *fname = "xxx_update2"; 36 int fd; 37 Elf *elf; 38 Elf32_Ehdr *ehdr; 39 Elf32_Phdr *phdr; 40 int i; 41 42 fd = open (fname, O_RDWR | O_CREAT | O_TRUNC, 0666); 43 if (fd == -1) 44 { 45 printf ("cannot open `%s': %s\n", fname, strerror (errno)); 46 exit (1); 47 } 48 49 elf_version (EV_CURRENT); 50 51 elf = elf_begin (fd, ELF_C_WRITE, NULL); 52 if (elf == NULL) 53 { 54 printf ("cannot create ELF descriptor: %s\n", elf_errmsg (-1)); 55 exit (1); 56 } 57 58 /* Create an ELF header. */ 59 ehdr = elf32_newehdr (elf); 60 if (ehdr == NULL) 61 { 62 printf ("cannot create ELF header: %s\n", elf_errmsg (-1)); 63 exit (1); 64 } 65 66 /* Print the ELF header values. */ 67 if (argc > 1) 68 { 69 for (i = 0; i < EI_NIDENT; ++i) 70 printf (" %02x", ehdr->e_ident[i]); 71 printf ("\ 72 \ntype = %hu\nmachine = %hu\nversion = %u\nentry = %u\nphoff = %u\n" 73 "shoff = %u\nflags = %u\nehsize = %hu\nphentsize = %hu\n" 74 "phnum = %hu\nshentsize = %hu\nshnum = %hu\nshstrndx = %hu\n", 75 ehdr->e_type, ehdr->e_machine, ehdr->e_version, ehdr->e_entry, 76 ehdr->e_phoff, ehdr->e_shoff, ehdr->e_flags, ehdr->e_ehsize, 77 ehdr->e_phentsize, ehdr->e_phnum, ehdr->e_shentsize, 78 ehdr->e_shnum, ehdr->e_shstrndx); 79 } 80 81 ehdr->e_ident[0] = 42; 82 ehdr->e_ident[4] = 1; 83 ehdr->e_ident[5] = 1; 84 ehdr->e_ident[6] = 2; 85 ehdr->e_type = ET_EXEC; 86 ehdr->e_version = 1; 87 ehdr->e_ehsize = 1; 88 elf_flagehdr (elf, ELF_C_SET, ELF_F_DIRTY); 89 90 /* Create the program header. */ 91 phdr = elf32_newphdr (elf, 1); 92 if (phdr == NULL) 93 { 94 printf ("cannot create program header: %s\n", elf_errmsg (-1)); 95 exit (1); 96 } 97 98 phdr[0].p_type = PT_PHDR; 99 elf_flagphdr (elf, ELF_C_SET, ELF_F_DIRTY); 100 101 /* Let the library compute the internal structure information. */ 102 if (elf_update (elf, ELF_C_NULL) < 0) 103 { 104 printf ("failure in elf_update(NULL): %s\n", elf_errmsg (-1)); 105 exit (1); 106 } 107 108 ehdr = elf32_getehdr (elf); 109 110 phdr[0].p_offset = ehdr->e_phoff; 111 phdr[0].p_offset = ehdr->e_phoff; 112 phdr[0].p_vaddr = ehdr->e_phoff; 113 phdr[0].p_paddr = ehdr->e_phoff; 114 phdr[0].p_flags = PF_R | PF_X; 115 phdr[0].p_filesz = ehdr->e_phnum * elf32_fsize (ELF_T_PHDR, 1, EV_CURRENT); 116 phdr[0].p_memsz = ehdr->e_phnum * elf32_fsize (ELF_T_PHDR, 1, EV_CURRENT); 117 phdr[0].p_align = sizeof (Elf32_Word); 118 119 /* Write out the file. */ 120 if (elf_update (elf, ELF_C_WRITE) < 0) 121 { 122 printf ("failure in elf_update(WRITE): %s\n", elf_errmsg (-1)); 123 exit (1); 124 } 125 126 /* Print the ELF header values. */ 127 if (argc > 1) 128 { 129 for (i = 0; i < EI_NIDENT; ++i) 130 printf (" %02x", ehdr->e_ident[i]); 131 printf ("\ 132 \ntype = %hu\nmachine = %hu\nversion = %u\nentry = %u\nphoff = %u\n" 133 "shoff = %u\nflags = %u\nehsize = %hu\nphentsize = %hu\n" 134 "phnum = %hu\nshentsize = %hu\nshnum = %hu\nshstrndx = %hu\n", 135 ehdr->e_type, ehdr->e_machine, ehdr->e_version, ehdr->e_entry, 136 ehdr->e_phoff, ehdr->e_shoff, ehdr->e_flags, ehdr->e_ehsize, 137 ehdr->e_phentsize, ehdr->e_phnum, ehdr->e_shentsize, 138 ehdr->e_shnum, ehdr->e_shstrndx); 139 } 140 141 if (elf_end (elf) != 0) 142 { 143 printf ("failure in elf_end: %s\n", elf_errmsg (-1)); 144 exit (1); 145 } 146 147 unlink (fname); 148 149 return 0; 150 } 151
